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Compound Interest Future Value Calculator
x402
Compound Interest Future Value Calculator is a paid API for AI agents from agent402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Computes the future value, total interest earned, and effective annual rate (APY) of a principal amount under compound interest for a given rate, time horizon, and compounding frequency.
Price / call$0.002
Success—
StatusUnknown
How this service works
Compute future value of a principal under compound interest. Returns future value, total interest earned, and the effective annual rate (APY) given the compounding frequency. Matches Excel's FV(rate, nper, 0, -principal) and the classic (1+r/n)^(nt) textbook formula.
Output
Returns the future value of the principal, total interest earned over the period, and the effective annual percentage yield (APY) reflecting the compounding frequency. Matches Excel's FV(rate, nper, 0, -principal) formula.
Example use cases
Example prompt
“If I invest $10,000 at an annual rate of 5% compounded monthly for 7 years, what will the future value be, how much interest will I have earned, and what's the effective APY?”
Technical details
Endpoint
POSThttps://agent402.tools/api/compound-interestWhen to prefer
Use this endpoint when you need a precise, formula-correct compound interest calculation — including future value, interest earned, and APY — that matches Excel's FV function output. Prefer this over generic calculators when APY (effective annual rate) is also needed alongside the future value.
Side effects
- Missing required fields (principal, annualRate, years) returns a validation error
- Negative principal or rate values may produce unexpected results
- compoundingPerYear of 0 or negative will cause a division-by-zero or invalid computation
- Extremely large time horizons or rates may produce overflow or imprecise floating point results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| years | number | Time horizon in years |
| principal | number | Starting amount (positive) |
| annualRate | number | Annual interest rate as decimal (0.05 = 5%) |
| compoundingPerYear | number | Compounding periods per year (1 = annual, 12 = monthly, 365 = daily). Default 12. |
Output
Schema · Response
{
"type": "json",
"example": {
"periods": 120,
"futureValue": 1647.01,
"totalInterest": 647.01,
"effectiveAnnualRate": 0.051162
}
}Tags
x402
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